There are a number of variables.
First and foremost, is the content of the disc PAL or NTSC? This can be an issue.
Assuming these are homemade DVDs, then the region coding would show as any number of options, usually Region 0 or no region info at all (the so-called "Region Free").
A final issue to consider is DVD-R and DVD+R formats. Some players play one better than the other. Assuming it can play either.
Sony makes picky players. There is no way around it.
Even so-called "world" players are not necessarily any more or less friendly to regions, DVD-R/DVD+R, or PAL/NTSC. There are so many variables.
In general, a Verbatim disc (Mitsubishi coded), a DVD-R especially, is going to be the most compatible of all available media on the market. It has a high reflectivity and is one of the best made discs around.
I would say the players, not the discs, are the problem.
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